电子束物理气相沉积La_2Ce_2O_7热障涂层的高温燃气热腐蚀行为研究

Hot-gas Corrosion Resistance of La_2Ce_2O_7/8YSZ Dubleceramic-layered Thermal Barrier Coating

采用电子束物理气相沉积(EB-PVD)方法在镍基高温合金表面制备了La2Ce2O7(LC)/8YSZ双陶瓷层热障涂层,研究了LC涂层在高温燃气热腐蚀条件下的高温稳定性以及涂层的抗热腐蚀性能。结果表明,LC陶瓷涂层在海水和航空煤油的热腐蚀环境下经过950℃曝露100 h后,涂层没有发生分解和相变,显示了良好的抗燃气热腐蚀性能;同时,金属粘结层表面形成了一层连续致密的氧化层。热障涂层经过循环腐蚀100 h后,仍然没有发生剥落失效。

Double-ceramic-layered （DCL） TBCs of La2Ce2O7（LC）/8YSZ were prepared by electron beam physical vapor deposition （EB-PVD） on Ni-base superalloy. The high temperature stability and corrosion-resistant property of TBCs was investigated in high temperature gas corrosion environment. The results show that no decomposition and phase transformation arises in the TBCs after 100 h exposure at 950 ℃ in the flowing air with aviation kerosene and artificial seawater. The TBCs display good high temperature gas corrosion-resistant property. A continuous and dense oxide scale forms on the bonding coat. No spallation of TBCs occurred after 100 h thermal cycling in the corrosion environment.